diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index 52b7242dd..a8ba4f4ee 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -89,7 +89,7 @@ class Mailer < ActionMailer::Base
     recipients ||= []
     # 只给该课程的老师发送邮件提醒
     course.members.each do |member|
-      if m.user.allowed_to?(:as_teacher,course)
+      if member.user.allowed_to?(:as_teacher,course)
         user = User.find(member.user_id)
         #@subject = "[#{l(:mail_homework)} #{homework_common.name}]  #{l(:mail_anonymous_comment_failed)}"
         @token = Token.get_token_from_user(user, 'autologin')